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  1. Testing a 300A on a B&K
  2. Diodes to tube
  3. PL84/EL86 push pull
  4. circuit diagram
  5. Ultralinear operation
  6. 60hz hum in component system
  7. Crackling Amp
  8. Regulated Supply for Direct Coupled Amp
  9. Explanation wanted
  10. Dynaco FM1 stereo updating ?
  11. tube amp diy off. Is this a good deal?
  12. SE driver
  13. DN2540 + LM317 cascode CCS?
  14. Recapping old tube amp
  15. How a SRPP stage sounds like?
  16. Help troubleshooting SE Pentode amp
  17. What meter for Bias?
  18. Mains tranformer noise
  19. Tube tester block diagram
  20. got a custom 829b amp that i got laying around, need to know what driver to use
  21. Universal filament regulator
  22. ECC88 - 6DJ8 Cascode Plate Curves
  23. Gain of Phase Inverter
  24. CF/CCS, can it be made simpler?
  25. 2A3 Heater Hum Pot
  26. Need help - black out while the amp. was on
  27. simple question about cathodyne PI
  28. Where can I get a cover for the OPT and PS
  29. Power supply for heater
  30. how to use oscilloscope
  31. I am collecting parts for my 200w mono amps "But"
  32. This seems wrong?
  33. StoetKit Junior Schematics
  34. Valve Amplifiers 3rd edition Errata
  35. Anybody ever compared the Eico HF81 to Harman Kardon A220 "The Lute"?
  36. 6v6 datasheet
  37. Leaving filaments on?
  38. output caps -- your observations, pleeze
  39. Low gain preamp.
  40. Recommended Tube/Valve references?
  41. Stand Alone guitar power amp
  42. Tube Socket Identification
  43. Some agreement on reasonable affordable and well performing design builds?
  44. Fletcher cooke OTL article
  45. I have 4 Pl504's. Are they best used as SE or PP ?
  46. More k12g amp musings
  47. How preserve loudness circuit with new volume pot?
  48. Where to find 212E tubes???
  49. Music Angel XD-SE EL34 Amp
  50. CV345 VS EL34
  51. Reducing Filment Hum in Tubes
  52. push pull power amp
  53. 6 ohm speakers....
  54. Need a 12.6 VDC power supply schematic
  55. Gold Lion KT88 Issue
  56. Plate currents in P-P
  57. Bass preamp + Edcor balanced out = HUM!
  58. Testing amplifiers with computer software...
  59. Welborn Labs - Abysmal Service
  60. Repairing broken pins on valuable tube...
  61. Explain how feedback affects DF?
  62. Low emissions
  63. Tube Blue Glow question
  64. Common-mode choke before or after?
  65. 6l6 data sheet question
  66. Mic preamp
  67. Physical Tube Diagnosis?
  68. how and why power amps clip
  69. 80's Guitar Amp...replacing o/p tubes...which 6L6 should i try?
  70. Vacuum Tube OTL power amp!!
  71. Tube replacement options.....
  72. balanced RIAA amp
  73. power amp distortion
  74. Suggestions for 5k5 40W iron?
  75. Peavey Classic 30 Reverb headscratcher...
  76. Schematic Tube Analog Output Stage???
  77. 300B 'direct drive' using a 6U8..
  78. Magnavox 88-02 power trans ratings?
  79. Preamp with humming noise!
  80. How to choose line out transformer?
  81. Tools for Cutting Tube Socket Holes?
  82. Switchable SE.
  83. GZ33 in place of 5U4 can it be done?
  84. phase splitter issue
  85. Armstrong A10 MK2 EL34 mono block
  86. "Ug" The Transformer
  87. i think its time i start playing with caps
  88. problems with preamp on home brew
  89. LS180 Tube Socket?
  90. simple question - 5V heater power supply
  91. Lineamp
  92. FI AUDİO 421 A
  93. Pete Millett has another Red Board for sale
  94. Jolida JD9 Problem
  95. 6N11 = 6N1P ?
  96. K12-G tube amp problem
  97. Please vote for one of the schematics.
  98. Advantages of separate PS for input and output stages
  99. Another PCB tube amp design
  100. Help. Replacement OPT sqrueeechhh.
  101. New concept of a power amp
  102. Lundahl and rectifier mismatch?
  103. Resurrecting weak tubes
  104. Best DHT heater?
  105. Help requested for EL84 SET amp
  106. What did I buy??
  107. Edcor and Custom Power Transformer Design
  108. What would you make with this power TX?
  109. Lundahl 1676
  110. DHT for 300B problem
  111. Newbie question about output transformer to speaker matching
  112. Red board add-on phono/RIAA pre-amp
  113. 2 Chassis amp
  114. Is It posible to bridge two quad II monoblocks?
  115. Power tube at work picture
  116. Tube SE power amp , which one??
  117. Hickok 539A issue
  118. Noise in one channel? Pioneer SX-400
  119. Hartung / Prestla OTL amps
  120. Lafayette Model 417
  121. Extreme plate load
  122. What do you think about this idea
  123. el84pse schem, need advice
  124. Video pentodes as outputs
  125. Custom Vibrolux Reverb noise issue
  126. Chinese "Audio Research" KT88s
  127. Fender bandmaster rectifire problem.
  128. New 6C33 Socket
  129. 2a3 PP output transformer
  130. PSU problem - Murphy is an ***hole!
  131. Best SET design?
  132. Anybody ever tried EBC41 as 12AX7 substitute?
  133. The 7242
  134. 12bh7a
  135. Phase Splitter Help
  136. Oscilloscope Question
  137. sizing opt
  138. 6P3C-E Datasheet help
  139. on the toroids again
  140. OPT problem or Something else 6L6 PP
  141. Look what I found!
  142. Help, Diy tube amp
  143. Idea
  144. a few DIY tube amplifier setups
  145. 6L6 PP amp motorboating
  146. Mayer-inspired 4P1L
  147. 6L6 WGB 2X34W STEREO AMPL
  148. Isolation transformation wiring project help
  149. Tube Amp DIY or Retail
  150. Supplier for GU50 tubes
  151. 2E26's
  152. Encel Stereophonic M.F.B CSM 40 amplifier
  153. Mono 300B SE Amplifier
  154. Broken tubes for 3D Modelling
  155. Loud hum in one channel
  156. 6EM7 PP question
  157. 12AU7/IRF610 Hybrid Amplifier
  158. 12AU7/IRF610 Hybrid Amplifier
  159. RIAA preamplifier
  160. Classic amp, Chinese or scratch-build for Quad ESL?
  161. CLASS A TUBE AMPLIFIER FOR TWEETER
  162. How to gap output transformers?
  163. Cathode bypasses - partial bypass and combination bias
  164. Phase splitter
  165. YS Audio balanced Preamp
  166. Low voltage 12AU7 (19J6) -- re "starving"
  167. phase splitter
  168. JTM30 output transformer
  169. Music Angel Meng 6P1
  170. Is it possible to dampen a partially microphonic 12ax7?
  171. Pioneer SA-810 tube amp.
  172. 6C33 D.C.M.B. - Paging Ari Polisois
  173. Whose is this logo?
  174. What is grid resistance of 807/6l6 in pentode
  175. PAS Upgrade Boards by Epperson
  176. Bang and Olufsen 609k stereo se el84 fm tuner
  177. Finished EL34 tube amp... but oscilates weird..
  178. Scope Trace
  179. Drifty tubes
  180. Choosing plate voltage
  181. Determining Zout for SRPP
  182. PX25 amplifier - thoughts?
  183. Testing Ck5703 tubes
  184. When can screen voltage be higher than plate???
  185. 31AL10's
  186. Lafayette TE-50 Tube Tester
  187. Acoustic (not Audio) Alchemy - I need a wizzard
  188. current feedback
  189. dac with tube buffer/preamp
  190. Sowter 3607
  191. Back to Loftin-White
  192. What to build? (I have a lot of parts)
  193. Grounding chassis through RCA
  194. K40Y-9: Questions And Comments
  195. buffer line stage schematic
  196. Dual triode Thanks for the pre-attenuation link
  197. Help With Alps Volume Pot Noise
  198. 6AM4 driving 45???
  199. Franks 6sn7 line stage question
  200. Edcor power tx XPWR035 issue
  201. Recommend me a schematic for El34 or KT88 ?
  202. RH84 Power supply
  203. Pentode driving a SE triode? any experience?
  204. Big tubes thread
  205. Meng Yayi KT88 MonoBlock
  206. Old Dumont Console - Story and Questions
  207. Newbie GlassWare Aikido All in One Questios
  208. Building my 1st tube amp
  209. A good tube for my SE 5K-8 OPT's
  210. 6c33 - ready, SET, GO
  211. Noisy tube rectifier goes quiet when i put my hand NEAR it
  212. Tweed 5E3 Deluxe Project Problems
  213. Strange ancient looking tube amp
  214. Vintage Dynaco vs. Triode Electronics
  215. LINE PRE - 6N9S - 6dB
  216. Can I balance a diff stage like this?
  217. Ways to design for low IM distortion
  218. Genalex KT88 Plate Dissipation Question
  219. difference between SE and PP transformer
  220. I put a bad ouput tube in my amp, did I hurt it?
  221. Vox AV 100 Mk2
  222. Stereo amplifyer project
  223. 6sl7 6sl7 dynaco driver board
  224. PCB for stand alone 5W SE
  225. Triode VS. UL bias
  226. How to test a DIY amp?
  227. Morgan Jones 4th ed
  228. How close is too close when designing an amp
  229. Fatman I tube Problem
  230. 807 p-p tube amp schematic
  231. TUBELAB SIMPLE SE
  232. Listen to 6DJ8 Triode through Power Chip IC. Easy project.
  233. Cheap motor caps(MKP) vs Electrolitics
  234. James O/P Tx
  235. Ripple reduction with added voltage compensation to HV
  236. SEVETLANA "SV" 6550 C vs 6550 C
  237. Frank's 6SN7 - plate follower, noise
  238. Help running RH807 at higher voltage
  239. Preamp hum issues
  240. EML mesh plate 2a3 in DRD amp
  241. How to run RH807 at 400V?
  242. Preamp Umbilical - Use Shield as Ground Lead?
  243. Automatic Bias Control sliding bias
  244. Edcor Output Transformer Resistance
  245. Would this be worthwile restoring?
  246. Historic Tube Amplifiers
  247. 6HF5 testing
  248. A quick question about NFB
  249. PAS3 - are the tone controls really *that* bad?
  250. PP OPT in SE mode operation?

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